Mason City, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 22° -34° (1899) 62° (2002) 0.9" NA
February 10° 29° -35° (1899) 67° (1981) 0.77" NA
March 22° 41° -32° (1962) 84° (1986) 2.02" NA
April 34° 56° 5° (1982) 95° (1980) 3.35" NA
May 46° 70° 23° (1967) 104° (1934) 4.37" NA
June 56° 80° 31° (1928) 104° (1934) 5.14" NA
July 61° 83° 38° (1899) 107° (1936) 4.45" NA
August 58° 80° 30° (1915) 103° (1930) 4.67" NA
September 48° 72° 15° (1899) 103° (1922) 3.34" NA
October 37° 60° -4° (1925) 94° (1963) 2.47" NA
November 23° 42° -14° (1897) 79° (2006) 2.07" NA
December 10° 27° -26° (1983) 65° (1998) 1.03" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 40° 63° 25° (1909) 90° (2007) 0.13" NA
May 2 41° 64° 23° (1967) 91° (1992) 0.13" NA
May 3 41° 64° 23° (1967) 91° (1918) 0.13" NA
May 4 42° 65° 24° (1907) 90° (1918) 0.13" NA
May 5 42° 65° 24° (1900) 91° (1924) 0.13" NA
May 6 43° 66° 25° (1989) 95° (1934) 0.13" NA
May 7 43° 66° 26° (1925) 89° (1934) 0.13" NA
May 8 43° 66° 27° (1925) 91° (1934) 0.13" NA
May 9 44° 67° 23° (1945) 88° (1911) 0.13" NA
May 10 44° 67° 27° (1909) 89° (1911) 0.13" NA
May 11 45° 68° 25° (1925) 89° (1987) 0.13" NA
May 12 45° 68° 29° (1928) 90° (1907) 0.13" NA
May 13 45° 69° 27° (1953) 91° (1940) 0.14" NA
May 14 46° 69° 30° (1910) 90° (1932) 0.14" NA
May 15 46° 69° 28° (1983) 90° (1988) 0.14" NA
May 16 47° 70° 26° (1921) 91° (1918) 0.14" NA
May 17 47° 70° 28° (1930) 94° (1934) 0.14" NA
May 18 47° 71° 33° (1925) 97° (1934) 0.14" NA
May 19 48° 71° 27° (1929) 97° (1934) 0.14" NA
May 20 48° 71° 28° (1907) 96° (1934) 0.14" NA
May 21 49° 72° 32° (1931) 93° (1970) 0.15" NA
May 22 49° 72° 29° (1931) 100° (1925) 0.15" NA
May 23 49° 73° 28° (1963) 88° (1926) 0.15" NA
May 24 50° 73° 32° (1924) 92° (1939) 0.15" NA
May 25 50° 73° 29° (1925) 93° (1978) 0.15" NA
May 26 50° 74° 32° (1961) 91° (1978) 0.15" NA
May 27 51° 74° 32° (1907) 92° (1980) 0.15" NA
May 28 51° 75° 32° (1947) 92° (1969) 0.16" NA
May 29 51° 75° 31° (1947) 98° (1934) 0.16" NA
May 30 52° 75° 31° (1930) 98° (1934) 0.16" NA
May 31 52° 76° 35° (1931) 104° (1934) 0.16" NA
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